Lore

The White Tree died in T.A. 2852 along with the death of the last King. It does not "regenerate" until Gandalf and Aragorn find sapling on the Mountain and re-plant it in the Citadel after Aragorn has been crowned King in T.A. 3019.

The White Tree is a symbol along with the Seven Stars, which appears on the Livery of Gondor. With the coming of Aragorn upon the black ships, and the unfurling of his banner at the Battle of Pelennor Fields, the crown of Gondor is used again as part of this livery.

Turbine Lore

The White Tree in LOTRO was modeled after Professor Tolkien's favorite tree in the Oxford Botanical Gardens, now cut down.[1]